package com.atguigu.juc;

/**
 * @author admin
 * <p>
 * 生产者与消费者案例
 */
public class TestProductorAndConsumer {

    public static void main(String[] args) {
        Clerk clerk = new Clerk();

        Productor productor = new Productor(clerk);
        Consumer consumer = new Consumer(clerk);

        new Thread(productor, "生产者A").start();
        new Thread(consumer, "消费者B").start();

        new Thread(productor, "生产者C").start();
        new Thread(consumer, "消费者D").start();

    }
}

/**
 * 店员
 */
class Clerk {

    private int product = 0;

    /**
     * 进货
     */
    public synchronized void get() {
        while (product >= 1) {
            System.out.println("产品已满！");

            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + " : " + ++product);

        this.notifyAll();
    }

    /**
     * 缺货
     */
    public synchronized void sale() {
        /*
        为了避免 虚假唤醒 问题，应该总是使用在循环中
         */
        while (product <= 0) {
            System.out.println("缺货！");

            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + " : " + --product);

        this.notifyAll();
    }
}

/**
 * 生产者
 */
class Productor implements Runnable {

    private Clerk clerk;

    public Productor(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {

            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.get();
        }
    }
}

/**
 * 消费者
 */
class Consumer implements Runnable {

    private Clerk clerk;

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            clerk.sale();
        }
    }
}
